package ar.com.sebasoft.prestalibro.view.activity;

import java.util.ArrayList;
import java.util.List;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.CursorLoader;
import android.content.Intent;
import android.content.Loader;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import ar.com.sebasoft.prestalibro.R;
import ar.com.sebasoft.prestalibro.controller.SocioController;
import ar.com.sebasoft.prestalibro.controller.SocioControllerListerner;
import ar.com.sebasoft.prestalibro.util.SystemHelper;

/**
 * A login screen that offers login via email/password.
 */
public class LoginActivity extends BaseActivity implements LoaderCallbacks<Cursor>, SocioControllerListerner {

	/**
	 * Keep track of the login task to ensure we can cancel it if requested.
	 */
	private UserLoginTask mAuthTask = null;

	private SocioController socioController = null;

	// UI references.
	private AutoCompleteTextView mEmailView;
	private EditText mPasswordView;
	private View mProgressView;
	private View mLoginFormView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.setContentView(R.layout.activity_login);

		SystemHelper.setCurrentContext(this.getApplicationContext());

		this.socioController = new SocioController(this.getApplicationContext(), this);

		// Set up the login form.
		this.mEmailView = (AutoCompleteTextView) this.findViewById(R.id.email);
		this.populateAutoComplete();

		this.mPasswordView = (EditText) this.findViewById(R.id.password);
		this.mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
			@Override
			public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
				if ((id == R.id.login) || (id == EditorInfo.IME_NULL)) {
					LoginActivity.this.attemptLogin();
					return true;
				}
				return false;
			}
		});

		Button mEmailSignInButton = (Button) this.findViewById(R.id.email_sign_in_button);
		mEmailSignInButton.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View view) {
				LoginActivity.this.attemptLogin();
			}
		});

		this.mLoginFormView = this.findViewById(R.id.login_form);
		this.mProgressView = this.findViewById(R.id.login_progress);
	}

	private void populateAutoComplete() {
		this.getLoaderManager().initLoader(0, null, this);
	}

	/**
	 * Attempts to sign in or register the account specified by the login form.
	 * If there are form errors (invalid email, missing fields, etc.), the
	 * errors are presented and no actual login attempt is made.
	 */
	public void attemptLogin() {
		if (this.mAuthTask != null) {
			return;
		}

		// Reset errors.
		this.mEmailView.setError(null);
		this.mPasswordView.setError(null);

		// Store values at the time of the login attempt.
		String email = this.mEmailView.getText().toString();
		String password = this.mPasswordView.getText().toString();

		boolean cancel = false;
		View focusView = null;

		// Check for a valid password, if the user entered one.
		if (!TextUtils.isEmpty(password) && !this.isPasswordValid(password)) {
			this.mPasswordView.setError(this.getString(R.string.error_invalid_password));
			focusView = this.mPasswordView;
			cancel = true;
		}

		// Check for a valid email address.
		if (TextUtils.isEmpty(email)) {
			this.mEmailView.setError(this.getString(R.string.error_field_required));
			focusView = this.mEmailView;
			cancel = true;
		} else if (!this.isEmailValid(email)) {
			this.mEmailView.setError(this.getString(R.string.error_invalid_email));
			focusView = this.mEmailView;
			cancel = true;
		}

		if (cancel) {
			// There was an error; don't attempt login and focus the first
			// form field with an error.
			focusView.requestFocus();
		} else {
			// Show a progress spinner, and kick off a background task to
			// perform the user login attempt.
			this.showProgress(true);
			this.mAuthTask = new UserLoginTask(email, password);
			this.mAuthTask.execute((Void) null);
		}
	}

	private boolean isEmailValid(String email) {
		// TODO: Replace this with your own logic
		return email.contains("@");
	}

	private boolean isPasswordValid(String password) {
		// TODO: Replace this with your own logic
		return password.length() > 4;
	}

	/**
	 * Shows the progress UI and hides the login form.
	 */
	@TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
	public void showProgress(final boolean show) {
		// On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
		// for very easy animations. If available, use these APIs to fade-in
		// the progress spinner.
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
			int shortAnimTime = this.getResources().getInteger(android.R.integer.config_shortAnimTime);

			this.mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
			this.mLoginFormView.animate().setDuration(shortAnimTime).alpha(show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
				@Override
				public void onAnimationEnd(Animator animation) {
					LoginActivity.this.mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
				}
			});

			this.mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
			this.mProgressView.animate().setDuration(shortAnimTime).alpha(show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
				@Override
				public void onAnimationEnd(Animator animation) {
					LoginActivity.this.mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
				}
			});
		} else {
			// The ViewPropertyAnimator APIs are not available, so simply show
			// and hide the relevant UI components.
			this.mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
			this.mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
		}
	}

	@Override
	public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
		return new CursorLoader(this,
		// Retrieve data rows for the device user's 'profile' contact.
				Uri.withAppendedPath(ContactsContract.Profile.CONTENT_URI, ContactsContract.Contacts.Data.CONTENT_DIRECTORY), ProfileQuery.PROJECTION,

				// Select only email addresses.
				ContactsContract.Contacts.Data.MIMETYPE + " = ?", new String[] { ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE },

				// Show primary email addresses first. Note that there won't be
				// a primary email address if the user hasn't specified one.
				ContactsContract.Contacts.Data.IS_PRIMARY + " DESC");
	}

	@Override
	public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
		List<String> emails = new ArrayList<String>();
		cursor.moveToFirst();
		while (!cursor.isAfterLast()) {
			emails.add(cursor.getString(ProfileQuery.ADDRESS));
			cursor.moveToNext();
		}

		this.addEmailsToAutoComplete(emails);
	}

	@Override
	public void onLoaderReset(Loader<Cursor> cursorLoader) {

	}

	private interface ProfileQuery {
		String[] PROJECTION = { ContactsContract.CommonDataKinds.Email.ADDRESS, ContactsContract.CommonDataKinds.Email.IS_PRIMARY, };

		int ADDRESS = 0;
		int IS_PRIMARY = 1;
	}

	private void addEmailsToAutoComplete(List<String> emailAddressCollection) {
		// Create adapter to tell the AutoCompleteTextView what to show in its
		// dropdown list.
		ArrayAdapter<String> adapter = new ArrayAdapter<String>(LoginActivity.this, android.R.layout.simple_dropdown_item_1line, emailAddressCollection);

		this.mEmailView.setAdapter(adapter);
	}

	/**
	 * Represents an asynchronous login/registration task used to authenticate
	 * the user.
	 */
	public class UserLoginTask extends AsyncTask<Void, Void, Boolean> {

		private final String mEmail;
		private final String mPassword;

		UserLoginTask(String email, String password) {
			this.mEmail = email;
			this.mPassword = password;
		}

		@Override
		protected Boolean doInBackground(Void... params) {
			LoginActivity.this.socioController.doUserLogin(this.mEmail, this.mPassword);

			return false;
		}

		@Override
		protected void onPostExecute(final Boolean success) {
			LoginActivity.this.mAuthTask = null;
			LoginActivity.this.showProgress(false);
		}

		@Override
		protected void onCancelled() {
			LoginActivity.this.mAuthTask = null;
			LoginActivity.this.showProgress(false);
		}
	}

	@Override
	public void onLoginSuccess() {
		Intent intent = new Intent(LoginActivity.this, MainActivity.class);
		this.startActivity(intent);
		this.finish();
	}

	@Override
	public void onLoginFailure() {
		this.runOnUiThread(new Runnable() {
			@Override
			public void run() {
				LoginActivity.this.mPasswordView.setError(LoginActivity.this.getString(R.string.error_incorrect_password));
				LoginActivity.this.mPasswordView.requestFocus();
			}
		});

	}

	@Override
	public void onLogoutSuccess() {
		// Nothing here

	}
}
